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    Status of the tilefish, Lopholatilus chamaeleonticeps, fishery off South Carolina and Georgia and recommendations for management

    • File:DNR_Fishery_Bulletin_Status_of_the_Tilefish_1989.pdf
      Description:PDF Document
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    Author
    Hightower, Joseph E.
    Grossman, Gary D.
    Subject
    Fishery management--South Carolina; Tilefish--South Carolina
    Description
    We used a sex- and age-structured model and CPUE data from commercial and research vessels to assess the current status of the tilefish, Loplwlatilus chamaeleonticeps, substock off South Carolina and Georgia. Based on commercial CPUE data and assumed natural mortality (M) rates of 0.10-0.25, we estimated that adult population density prior to fishing ranged from 603 to 950 per km2 and stock biomass ranged from 1,130 to 1,570 tonnes (t). Our estimates of the recommended fishing mortality rate ranged from 0.10 eM - 0.10) to 0.48 (M = 0.25), resulting in sustainable yields of 40 (M - 0.10) to 82 t eM = 0.25) per year. We obtained higher estimates of virgin population density (883-1,710 per km~ when research CPUE data were used. Sustained yield estimates also were higher, ranging from 55 (M - 0.10) to 148 t (M = 0.25) per year. Average estimates of recommended yield from commercial and research CPUE data were 58 and 95 t, respectively. Observed yields in the developing fishery exceeded 100 t in 1981-84 and in 1986; however, current observations indicate that fishing effort has declined to a low level in response to reduced catches. Based on the assumption that commercial CPUE data better reflect population trends, we recommend that the annual harvest not exceed about 50 t, which should result in a stock biomass of about 400-800 t. Apparent limitations on sustainable yield from the fishery probably can be attributed to the long lifespan, slow growth rate, and sedentary nature of tilefish.
    URI
    http://hdl.handle.net/10827/10568
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    • Fishery Bulletin
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    Date
    1989
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    Date Accessioned2013-08-23T12:45:19Z
    Date Available2013-08-23T12:45:19Z
    dc.descriptionWe used a sex- and age-structured model and CPUE data from commercial and research vessels to assess the current status of the tilefish, Loplwlatilus chamaeleonticeps, substock off South Carolina and Georgia. Based on commercial CPUE data and assumed natural mortality (M) rates of 0.10-0.25, we estimated that adult population density prior to fishing ranged from 603 to 950 per km2 and stock biomass ranged from 1,130 to 1,570 tonnes (t). Our estimates of the recommended fishing mortality rate ranged from 0.10 eM - 0.10) to 0.48 (M = 0.25), resulting in sustainable yields of 40 (M - 0.10) to 82 t eM = 0.25) per year. We obtained higher estimates of virgin population density (883-1,710 per km~ when research CPUE data were used. Sustained yield estimates also were higher, ranging from 55 (M - 0.10) to 148 t (M = 0.25) per year. Average estimates of recommended yield from commercial and research CPUE data were 58 and 95 t, respectively. Observed yields in the developing fishery exceeded 100 t in 1981-84 and in 1986; however, current observations indicate that fishing effort has declined to a low level in response to reduced catches. Based on the assumption that commercial CPUE data better reflect population trends, we recommend that the annual harvest not exceed about 50 t, which should result in a stock biomass of about 400-800 t. Apparent limitations on sustainable yield from the fishery probably can be attributed to the long lifespan, slow growth rate, and sedentary nature of tilefish.
    Media TypeDocument
    Item LanguageEnglish
    PublisherSouth Carolina State Library
    Digital CollectionSouth Carolina State Documents Depository
    RightsCopyright status undetermined. For more information contact, South Carolina State Library, 1500 Senate Street, Columbia, South Carolina 29201.
    TypeText
    Digitization SpecificationsThis South Carolina State Document was either saved from a document available publicly online in PDF format or converted to PDF using Adobe Acrobat X Professional.
    

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